unless you are having problems, I would leave it alone.... I have stock pumps on each of mine to date.....but did replace one on warranty... I keep my johnson on the shelf as back up for now. I was going to install it a couple of times, but I just haven't had a reason to yet... If the pump fails it won't leave you stranded, just won't give you the power of the SC....you can limp it home and install the johnson ....therefore you won't have a limp johnson, but a fully functional johnson.... Besides, your johnson is upside down....isn't it? OK, I will leave that alone.....that was another thread....